Evaluate the Shearing Strength of Sandy Soil Using the Direct Shear Test Apparatus

The purpose of the direct shear test is to find soil’s shearing strength. A special type of apparatus is required to evaluate sandy soil’s shearing strength, which will help predict the material’s suitability for building foundations and for supporting retaining walls, slab bridges, sheet piling, and pipes. The test should also be able to identify the value of internal friction’s angle and soil cohesion when designing structures. One of the most advanced direct shear test apparatus is an automatic direct and residual shear testing machine, which comes with a carriage assembly, load hanger, and the integral 10:1, 11:1, and 9:1 lever loading device.

A high-end direct shear test apparatus is designed to be floor mounted and motorised. A beam loading device is supplied to strengthen the shear box assembly’s vertical load, and it can handle up to 50kg. The total load on the specimen can reach up to 5kM. The machine is compatible with various round and square shear box assemblies, made to contain water which surrounds the specimen. Assemblies consist of a shear box (rigid round hole or wall square), a vertical loading pad, perforated grids, plane grids, grooved retaining plate, and porous plates.

The shear machine is managed via a high-resolution gear box and servomotor assembly. The fully stepless speed range varies from 0.00001 to 9.99999 mm/min for both forward and reverse directions. After testing, the reverse speed becomes 10mm/min. The load is measured with a 5 kN load cell. Horizontal displacement is measured with 25, 0.001mm sensitivity linear potentiometric transducers. Vertical displacement is measured with 10, 0.001mm transducers. A limit switch controls displacement limits.

A direct shear test apparatus can be upgraded with optional accessories including a cutter for specimens, slotted weight set, shear box assembly, and an extrusion dolly. Software is used to calculate the resilient and maximum shear stress. Following three runs, the software calculates the best straight line to determine the shear resistance angle and cohesion value.
Location: Niddrie VIC 3042, Australia

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